yum update kusanagi -y コマンドでエラーとなります。

sakura vpsにkusanagi8をインストールし、WordPressを公開しようとしています。
https://kusanagi.tokyo/document/kusanagi-init/
公式の上記の手順に沿って、セットアップを進めようとしたところ表題のように、序盤の
yum update kusanagi -y
コマンドで下記のエラーがててしまい先に進めません。
何が原因かわかる方はいらっしゃいませんでしょうか。

One of the configured repositories failed (MariaDB), and yum doesn't have enough cached data to continue. At this point the only safe thing yum can do is fail. There are a few ways to work "fix" this: 1. Contact the upstream for the repository and get them to fix the problem. 2. Reconfigure the baseurl/etc. for the repository, to point to a working upstream. This is most often useful if you are using a newer distribution release than is supported by the repository (and the packages for the previous distribution release still work). 3. Run the command with the repository temporarily disabled yum --disablerepo=mariadb ... 4. Disable the repository permanently, so yum won't use it by default. Yum will then just ignore the repository until you permanently enable it again or use --enablerepo for temporary usage: yum-config-manager --disable mariadb or subscription-manager repos --disable=mariadb